Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2003, 04 PMC-Sierra Inc. |
| 3 | * Author: Manish Lachwani (lachwani@pmc-sierra.com |
| 4 | * Copyright 2004 Ralf Baechle (ralf@linux-mips.org) |
| 5 | * |
| 6 | * First-level interrupt router for the PMC-Sierra Titan board |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License as published by the |
| 10 | * Free Software Foundation; either version 2 of the License, or (at your |
| 11 | * option) any later version. |
| 12 | * |
| 13 | * Titan supports Hypertransport or PCI but not both. Hence, one interrupt |
| 14 | * line is shared between the PCI slot A and Hypertransport. This is the |
| 15 | * Processor INTB #0. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/config.h> |
| 19 | #include <asm/asm.h> |
| 20 | #include <asm/mipsregs.h> |
| 21 | #include <asm/addrspace.h> |
| 22 | #include <asm/regdef.h> |
| 23 | #include <asm/stackframe.h> |
| 24 | |
| 25 | .align 5 |
| 26 | NESTED(titan_handle_int, PT_SIZE, sp) |
| 27 | SAVE_ALL |
| 28 | CLI |
| 29 | .set at |
| 30 | .set noreorder |
| 31 | la ra, ret_from_irq |
| 32 | mfc0 t0, CP0_CAUSE |
| 33 | mfc0 t2, CP0_STATUS |
| 34 | |
| 35 | and t0, t2 |
| 36 | |
| 37 | andi t2, t0, STATUSF_IP7 /* INTB5 hardware line */ |
| 38 | bnez t2, ll_timer_irq /* Timer */ |
| 39 | andi t1, t0, STATUSF_IP2 /* INTB0 hardware line */ |
| 40 | bnez t1, ll_pcia_irq /* 64-bit PCI */ |
| 41 | andi t2, t0, STATUSF_IP3 /* INTB1 hardware line */ |
| 42 | bnez t2, ll_pcib_irq /* second 64-bit PCI slot */ |
| 43 | andi t1, t0, STATUSF_IP4 /* INTB2 hardware line */ |
| 44 | bnez t1, ll_duart_irq /* UART */ |
| 45 | andi t2, t0, STATUSF_IP5 /* SMP inter-core interrupts */ |
| 46 | bnez t2, ll_smp_irq |
| 47 | andi t1, t0, STATUSF_IP6 |
| 48 | bnez t1, ll_ht_irq /* Hypertransport */ |
| 49 | |
| 50 | move a0, sp |
| 51 | j do_extended_irq |
| 52 | END(titan_handle_int) |
| 53 | |
| 54 | .set reorder |
| 55 | .align 5 |
| 56 | |
| 57 | ll_pcia_irq: |
| 58 | li a0, 2 |
| 59 | move a1, sp |
| 60 | #ifdef CONFIG_HYPERTRANSPORT |
| 61 | j ll_ht_smp_irq_handler |
| 62 | #else |
| 63 | j do_IRQ |
| 64 | #endif |
| 65 | |
| 66 | ll_pcib_irq: |
| 67 | li a0, 3 |
| 68 | move a1, sp |
| 69 | j do_IRQ |
| 70 | |
| 71 | ll_duart_irq: |
| 72 | li a0, 4 |
| 73 | move a1, sp |
| 74 | j do_IRQ |
| 75 | |
| 76 | ll_smp_irq: |
| 77 | li a0, 5 |
| 78 | move a1, sp |
| 79 | #ifdef CONFIG_SMP |
| 80 | j titan_mailbox_irq |
| 81 | #else |
| 82 | j do_IRQ |
| 83 | #endif |
| 84 | |
| 85 | ll_ht_irq: |
| 86 | li a0, 6 |
| 87 | move a1, sp |
| 88 | j ll_ht_smp_irq_handler |
| 89 | |
| 90 | ll_timer_irq: |
| 91 | li a0, 7 |
| 92 | move a1, sp |
| 93 | j do_IRQ |